Add a tutorials folder with simple tutorials

crates/eframe/tutorials/layout.md

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+# Layout tutorials
+
+## Make group fill full height of its parent
+
+```rust
+ui.group(|ui| {
+    // Stuff blah blah blah
+    ui.set_height(ui.available_height());
+});
+```

crates/eframe/tutorials/miscellaneous.md

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+# Miscellaneous tutorials

crates/eframe/tutorials/technical.md

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+# Technical tutorials
+
+## Press a button when a key is pressed
+
+If you want to have something that happens when either:
+
+- a button is clicked, or
+- a key is pressed
+
+This is how you can do that:
+
+```rust
+let my_button = ui.button("Press me");
+
+if my_button.clicked() || ui.input(|i| i.key_pressed(egui::Key::Enter)) {
+    // Do awesome stuff
+}
+```
+
+Now, whenever `my_button` is clicked _or_ the `Enter` key is pressed, they will do the same thing.

crates/eframe/tutorials/tutorials.md

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+# `eframe` Tutorials
+
+This is a list of tutorials to do small things using eframe
+
+- [Layout](./layout.md)
+- [Technical](./technical.md)
+- [Miscellaneous](./miscellaneous.md)
+
+---
+
+These tutorials are a work in progress. You can contribute to them by submitting a PR on GitHub